I got it at Young's nursery - there are several so here is the link
www.youngs-garden.com
They give a free plant with each order, usually a different cultivar from what you ordered so you can see others. This was a great surprise, I'd read that they did this but forgot so when I received the order and it was in there I was so excited, and now that it looks so good, I'm even happier! I highly recommend Youngs and SMG (squawmountaingardens.com) partly because I'm in Seattle so it feels local(ish)
I think your semp may have to be added to my list Cruddy (has anyone told you that its a cool screenname?)
Remember cruddy -you've been warned! I innocently came on here looking for growing advice with my 15 or so semps and now after only less than 3 months I don't even know how many I have, but lots! probably 60 different cultivars, its been totally fun though!
